13-Letter Words Matching ___I_______U_

There are 17 13-letter words that match ___I_______U_. 3 are common words, such as NONINFECTIOUS and PUSILLANIMOUS. A rarer one is UNPICTURESQUE. In this set, O is the most frequent open letter (16 words). 4 words contain a doubled letter.

Full list 17

noninfectiouspusillanimoussemiconsciousactinouraniumanticlinoriumantireligiousargilliferouslepidopterousperichondriumsemireligiousangiospermouscleistogamousmedicamentousmeningococcusnonindigenouspapillomatousunpicturesque

About this list

Words
17 (3 common words)
Common example
noninfectious
Rare example
unpicturesque
Doubled letters
4
Ending in S
13
Most frequent letter
O (16)

Questions

How many 13-letter words matching ___i_______u_ are there?

17. 3 of them are common words.

What is a common example?

NONINFECTIOUS is among the common words in this set.